Altecnic launches new compact anti-freeze valve

With a compact design and the ability to install valves vertically in parallel, the iStop® PLUS provides a solution for the most restricted spaces…

Altecnic, the UK’s leading supplier of hydronic solutions and part of the Caleffi Group, has launched a new compact anti-freeze valve, the iStop® PLUS, in the UK and Ireland markets.

Setting the standard in efficiency and convenience, the iStop® PLUS boasts a compact size, as well as a sensor on the side.

It differs from traditional anti-freeze valves as it offers remarkably small dimensions without compromising performance.


Its innovative design, featuring an off-axis sensor configuration, enables installation even in the most restricted spaces and caters to the diverse needs of modern installations.

Furthermore, the iStop® PLUS has been designed to allow for overlapping installation capability. Installers can therefore seamlessly install valve pairs without the need for minimum spacing.

This flexibility not only streamlines installation processes but also optimises space utilisation.

Less space is also required for drainage underneath the valve, making it suitable for connection to self-contained heat pumps with connections for pipes at the bottom of the casing.

Equipped with an exceptional sensitivity to water temperature, the iStop® PLUS boasts heightened responsiveness to ensure prompt and precise performance, therefore enhancing system reliability and user confidence.

With this, the new anti-freeze valve is engineered to withstand high water temperature of up to 90°C.

This durability allows the valve to operate with any heat pump and underscores Altecnic’s commitment to delivering products of high quality and performance.

Gary Perry, Managing Director, Altecnic, said, “With the iStop® PLUS, we are introducing a solution that addresses the evolving needs of modern installations that installers are faced with.

“Its compact size, coupled with its ability to function in restricted spaces, offers flexibility and ease of use.

“At Altecnic, we strive to innovate with quality solutions that meet and exceed the expectations of our customers so they can remain ahead in our industry as the shift towards net zero solutions continues.”

To find out more about the new iStop® PLUS click here.


For more information, contact Chris Reilly, Country Manager for Ireland,

on +353 (0)85 215 2288 or e-mail

or visit the website at